High-resolution measurements of the DT neutron spectrum using new CD foils in the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility

Gatu Johnson, M.; Frenje, J. A.; Bionta, R. M.; Casey, D. T.; Eckart, M. J.; Farrell, M. P.; Grim, G. P.; Hartouni, E. P.; Hatarik, R.; Hoppe, M.; Kilkenny, J. D.; Li, C. K.; Petrasso, R. D.; Reynolds, H. G.; Sayre, D. B.; Schoff, M. E.; Séguin, F. H.; Skulina, K.; Yeamans, C. B.

doi:10.1063/1.4959946

High-resolution measurements of the DT neutron spectrum using new CD foils in the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility

Journal Article · Tue Aug 09 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959946· OSTI ID:1312738

Gatu Johnson, M. ^[1]; ^[2]; Bionta, R. M. ^[3]; Casey, D. T. ^[3]; Eckart, M. J. ^[3]; ^[4]; Grim, G. P. ^[3]; ^[3]; Hatarik, R. ^[3]; Hoppe, M. ^[4]; Kilkenny, J. D. ^[4]; Li, C. K. ^[2]; ^[2]; ^[4]; Sayre, D. B. ^[3]; Schoff, M. E. ^[4]; Séguin, F. H. ^[2]; Skulina, K. ^[3]; ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); HEDP DIVISION, MIT PLASMA SCIENCE AND FUSION CENTER
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility measures the DT neutron spectrum from cryogenically layered inertial confinement fusion implosions. Yield, areal density, apparent ion temperature, and directional fluid flow are inferred from the MRS data. Here, this paper describes recent advances in MRS measurements of the primary peak using new, thinner, reduced-area deuterated plastic (CD) conversion foils. The new foils allow operation of MRS at yields 2 orders of magnitude higher than previously possible, at a resolution down to ~200 keV FWHM.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center, HEDP Div.

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0001808; NA0001857

OSTI ID:: 1312738

Alternate ID(s):: OSTI ID: 22596537
OSTI ID: 1466960

Report Number(s):: LLNL-JRNL--745982

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

The high velocity, high adiabat, “Bigfoot” campaign and tests of indirect-drive implosion scaling Casey, D. T.; Thomas, C. A.; Baker, K. L. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5019741	journal	May 2018
Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility Gatu Johnson, M.; Katz, J.; Forrest, C. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035287	journal	October 2018
Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility Parker, C. E.; Frenje, J. A.; Johnson, M. Gatu Review of Scientific Instruments, Vol. 89, Issue 11 https://doi.org/10.1063/1.5052184	journal	November 2018

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